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MFSK water sound communication method and MFSK water sound communication system

An underwater acoustic communication and signal technology, applied in the field of communication, can solve the problems of low communication rate per unit bandwidth and difficulty in accurately estimating frequency, and achieve the effect of improving frequency utilization efficiency, reducing frequency interval, and increasing communication rate

Inactive Publication Date: 2016-03-16
THE THIRD RES INST OF CHINA ELECTRONICS TECH GRP CORP
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Problems solved by technology

But it has the following disadvantages: it needs a wide frequency bandwidth and the communication rate per unit bandwidth is low
[0004] In order to increase the rate of MFSK communication, it is hoped to reduce the interval between frequency points and frequency points as much as possible, and reduce the duration of each symbol, but this makes it difficult to accurately estimate the frequency

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  • MFSK water sound communication method and MFSK water sound communication system
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  • MFSK water sound communication method and MFSK water sound communication system

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[0028] Below, the substantive features and advantages of the present invention will be further described in conjunction with examples, but the present invention is not limited to the listed examples.

[0029] see figure 1 As shown, a MFSK underwater acoustic communication method includes a signal modulation step and a signal mediation step, the signal mediation step includes a frequency estimation step, and in the signal modulation step, an m-sequence is used to modulate a digital signal to broaden the signal The frequency spectrum is then modulated to the radio frequency signal and sent out; in the signal mediation step, the m-sequence is first used to perform correlation calculations with the received signal, and the peak starting position of each symbol is estimated to realize symbol synchronization, and then the symbol is despread, and then Frequency estimation. In the frequency estimation step, a CZT transform algorithm is used to refine the frequency spectrum of the desp...

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Abstract

The invention relates to MFSK water sound communication method and an MFSK water sound communication system. According to the method, m sequence is employed for digital signal modulation, after signal frequency spectrum broadening, the m sequence is modulated to a radio frequency signal, and the modulation radiofrequency signal is sent out; during signal demodulation, correlation operation of the m sequence and a reception signal is carried out, a peak initial position of each code element is estimated to realize code element synchronization, code element diffusion is then realized, then frequency estimation is carried out, a CZT transformation algorithm is employed for frequency estimation to realize frequency spectrum refinement for the frequency band signal after despreading, the refined frequency spectrum is acquired, channel decoding is carried out according to the refined frequency spectrum, output is carried out, the reception signal frequency spectrum is better refined, the smallest frequency interval is smaller, code element length requirements during frequency estimation are reduced, a communication rate is improved, the frequency interval is reduced, frequency utilization efficiency is improved, and code element synchronization processing is made to be more precise.

Description

technical field [0001] The invention belongs to the technical field of communication, and in particular relates to an MFSK underwater acoustic communication method and system. Background technique [0002] Multi-frequency shift keying (MFSK) uses different frequencies and the same waveform to represent different symbols, which can effectively overcome inter-symbol interference and phase distortion, and has strong resistance to time diffusion and frequency diffusion , so this method has been widely used in underwater acoustic communication. But it has the following disadvantages: it requires a wide frequency bandwidth and the communication rate per unit bandwidth is low. In order to increase the rate of MFSK communication, it is hoped to reduce the interval between frequency points and frequency points as much as possible, and reduce the duration of each symbol, which makes it difficult to accurately estimate the frequency during demodulation. [0003] The main frequency es...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04B13/02H04L27/10
CPCH04B13/02H04L27/106
Inventor 尹航张学磊董雷刘德铸铁煜石建飞
Owner THE THIRD RES INST OF CHINA ELECTRONICS TECH GRP CORP
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